We first briefly describe the basic strategy to derive bounds [1]}. We consider the vector of low-energy couplings of the same dimensionality \(\vec{F}\)  which via dispersion relations is given by the sum of \(s\) - and \(u\) -channel partial waves
\(\vec{F} = \sum _J \left( c_{J,s} \vec{V}_{J,s} + c_{J,u} \vec{V}_{J,u} \right) , ~~~~~ c_{J,s} , c_{J,u} \ge 0 \, .\) 
